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Focal clustering (- Gi[d] for P < 0.05) of bug abundance around A, the 1993 pig corral source in 1995 (solid line), 1996 (dashed line), and 1997 (dotted line), and B, around the store room of A30 in November 1996 (dotted line), pig corral A107 in November 1996 (dashed line), and pig corral A46 in November 1997 (solid line).
